I guess I'm confused. I've been reading this thread because a DirecTivo may be in my future, and I just ordered Vonage. The ATA that I was sent is a Motorola one, not a Cisco. Is this new? Or, is the motorola actually a Cisco ATA in a different box? If it's a different ATA, has anyone had any experiences with their DirecTivo and this motorola box?

Changing the dial prefix to a telephone number may not be your best option if you are on the 500 minute plan running a series 1 DTiVo.

Series 1 owners (and not just Voip users) have been reporting excessive DirecTV dialing behavior. When you change the dialing prefix I believe your DirecTV calls will be made using that number. I have experienced more than 100 minutes of DirecTV calls per month.